MTNR1B and type 2 diabetes mellitus: Moreover, GWAS offered a broader insight into the epidemiology of T2D by identifying potential genetic links between lipid dysregulation and glycaemia (FADS1, HNF1A, and GCKR), circadian rhythmicity and metabolic alterations (MTNR1B and CRY2), and between low birth weight and subsequent T2D risk (ADCY5) [10,16].